JRDB [1]} additionally provides the information that the annotated target is occluded or not, which includes "Fully Visible", "Mostly Visible", "Severly Occluded" and "Fully Occluded". These information can help us further filter the bad samples. The constraint is shown as:
\(\left\lbrace \begin{matrix}discard,\ i \in "Fully Occluded"\\keep,\ j \in others\\\end{matrix}\right.\) 
